We report on five patients with anomalies of the inferior vena cava wh
o all presented with deed venous thrombosis. The anomalies of the infe
rior vena cava were diagnosed with CT, and at the same time thrombosis
of the inferior vena cava and/or iliofemoral thrombosis could be demo
nstrated. Malformation of the inferior vena cava might be a predisposi
ng factor for deep venous thrombosis.